Study on Structural Deformation of Pit in Thick Alluvial Clay Based on Different Constitutive Models

王丹; 王国富; 路林海; 孙捷城

doi:10.13409/j.cnki.jdpme.2016.06.013

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Study on Structural Deformation of Pit in Thick Alluvial Clay Based on Different Constitutive Models

更新时间：2025-12-11

- Study on Structural Deformation of Pit in Thick Alluvial Clay Based on Different Constitutive Models
- Vol. 36, Issue 6, Pages: 936-942+949(2016)
- 作者机构：
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- DOI：10.13409/j.cnki.jdpme.2016.06.013
  CLC： U473
- Published：2016
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[1]王丹,王国富,路林海,孙捷城.基于不同本构模型黄河厚冲积层基坑开挖结构变形分析[J].防灾减灾工程学报,2016,36(06):936-942+949.

王丹, 王国富, 路林海, et al. Study on Structural Deformation of Pit in Thick Alluvial Clay Based on Different Constitutive Models[J]. 2016, 36(6): 936-942+949.
[1]王丹,王国富,路林海,孙捷城.基于不同本构模型黄河厚冲积层基坑开挖结构变形分析[J].防灾减灾工程学报,2016,36(06):936-942+949. DOI： 10.13409/j.cnki.jdpme.2016.06.013.

王丹, 王国富, 路林海, et al. Study on Structural Deformation of Pit in Thick Alluvial Clay Based on Different Constitutive Models[J]. 2016, 36(6): 936-942+949. DOI： 10.13409/j.cnki.jdpme.2016.06.013.

摘要

采用理论分析结合现场实测数据

以黄河厚冲积层地质条件下某深大基坑开挖为实例

利用修正剑桥、西原正夫及改进的西原正夫等5种本构模型

通过FLAC仿真软件构建3D数值模型

分析基坑开挖引起的围护桩变形规律、墙后土体沉降变化特征、坑底土体上移趋势及抗浮桩侧摩阻力分布特点。结果表明:西原正夫本构模型可描述粘土体的蠕变变形

能准确追踪围护桩侧向位移;修正剑桥模型通过自动调整自身抗剪强度和弹性模量等参数

可给出墙后土体沉降的正确规律;摩尔库伦模型拟合得到的坑底土体上移曲线与现场实测数据较吻合;在改进的西原正夫及修正剑桥模型下

计算得到的抗浮桩侧摩阻力最为保守。上述规律可供预测基坑后续运营期间的结构变形、延长结构的服役年限参考。

Abstract

In this paper we analyse the deformation of retaining pile and subsidence of ground and upward displacement and characteristic of side friction of anti-floating pile via the FLAC3 Dbased on modified cam-clay model

Nishihara model and improved Nishihara model under the pit which is located in the thick alluvial clay.By using the field test data

we anlysise the structural deformations.The conclusion is drawn that the Nishihara model can describe the horizontal displacement

because the model can calculate the creep deformatin of the clay.The modified camclay model can describe the subsidence of the ground behind the wall

because it can adjust the parameters of shear strength and elastic moulus.The Mohr-Coulomb model can track the upward displacement of pit bottom.In the condition of improved Nishihara model and modified Cam-clay model the calculated data is conservative.The conclusion can provide important guidance for the structure deformation in long run and prolong the service years.

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references

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